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林修洲.Ti6Al4V 合金在Saline溶液中的扭动微动磨损[J].稀有金属材料与工程(英文),2019,48(6):1742~1748.[Lin Xiuzhou.Torsional Fretting Wear of Ti6Al4V Alloys in Saline Solutions[J].Rare Metal Materials and Engineering,2019,48(6):1742~1748.]
Torsional Fretting Wear of Ti6Al4V Alloys in Saline Solutions
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Received:February 07, 2018  Revised:May 23, 2019
DOI:
Key words: Fretting wear  Torsional fretting  Titanium alloy  Saline solution
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Lin Xiuzhou  
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Abstract:
      Four fretting modes exist in ball-on-flat contact according to the direction of relative motion, i.e. tangential, radial, rotational, and torsional fretting. Torsional fretting in a physiological medium is one of the main reasons that artificial joints fail. A new test system was successfully established for torsional fretting in a liquid medium at a constant temperature in a torsional mode with a ball-on-flat contact. The torsional fretting experiments were conducted on Titanium alloys against Zirconium dioxide ceramic balls in a saline solution at 37°C, and the torsional fretting running behaviors and damage mechanisms were discussed in detail. The results showed that the dynamics behaviors were strongly depended upon the torsional angular displacement amplitude and the number of cycles. A running condition fretting map (RCFM) was established, which included 3 fretting running regimes: a partial slip regime (PSR), a mixed fretting regime (MFR), and a slip regime (SR). No damage was observed on the contact center and only slight scratch and wear were observed on the contact edge in the PSR. The damage zone extended to the contact center and the sticking zone (which exhibited no damage) contracted to the contact center with increases in the number of cycles, and some oxidation wear and damage presented on the contact edge region in the MFR. The damage mechanisms were primarily the result of abrasive wear, oxidation wear and adhesion wear in the SR.